Jared, I've been studying a highly magnified copy of
the the photo you posted of "whitelockii" and it appears there may be
pubescence (hair) on the petioles. In a few specimens the petioles appear
terete (round) but in others some appear to be canaliculate (C shaped).
Can you verify this? And if possible, closeup photos of the upper and
lower surfaces of the blade as well as the roots and petioles would be of
interest.

Please DON`T take my suggestion a ''final'' solution. I usually try
to stay out of these discussions on I.D.`ing store-bought plants, but this one
is interesting now that I have seen a photo. It is not a ''birds
nest" type, and is NOT in my opinion a pure species. The up-turned
posterior lobes of the leaves which create the impression of a
''cup"" are NOT like A. fausto., which has a HUGE, almost flat
cordate leaf, VERY 'hard-textured'. Steve will have photos on his site of
a pure A. faustomir.
I`d like to see a photo of an inflorescence on this (Jared`s) plant, as the
bloom on a pure A. fausto. is large, and has a cup-shaped large spathe which
spreads over the spadix like a roof, and a very short
peduncle/stem. Jared`s plant might exibit a different
spathe/peduncle which may offer hints as to the plant`s possibly mixed
parentage.